用探测棒研究颗粒堆中的最大静摩擦力  

Studies of maximum static friction force in granular pile with probing rod

作　　者：孔维姝[1] 胡林[1] 杜学能[1] 张兴刚[1] 王伟明[1] 吴宇[1] 

机构地区：[1]贵州大学理学院贵州省光电子技术与应用重点实验室,贵阳550025

出　　处：《物理学报》2007年第4期2318-2322,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10374021);贵州省省长基金(批准号:20061128);贵州省高层次人才基金(批准号:20061227)资助的课题.~~

摘　　要：实验研究了筒仓内颗粒堆中部的竖直探测棒被提拉时受到的最大静摩擦力F.研究发现:当筒仓半径R小于0.040m时,F随R的增加而减少,当R大于0.045m时,F几乎不受R的影响.F随颗粒堆高度h变化的实验数据可以用公式F=A[h+B(e-h/B-1)]拟合,拟合参数A与探测棒横截面形状及备制颗粒堆的流量有关,拟合参数B与备制颗粒堆的流量有关.Experiments are designed to explore the maximum static friction F on a dragged probing rod in a granular pile contained in a cylindrical vessel. The results show that F decreases with the radius R of the cylindrical vessel increasing when R is smaller than 0.040 m, and F scarcely changes with R for R 〉 0.045 m. Curve fitting shows that F is as a function of h （the height of the granular pile）, namely F = A[ h ＋ B（e^-h/B - 1） ], here the parameter A relates to the shape of probing red and the flow rate of injecting granules into the cylindrical vessel, and parameter B depends on the flow rate of injecting granules into the cylindrical vessel.

关 键 词：颗粒物质 静摩擦力 数据拟合 

分 类 号：O415[理学—理论物理]